Hannover 2003 – scientific programme

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MO: Molekülphysik

MO 12: Poster II

MO 12.27: Poster

Thursday, March 27, 2003, 16:00–18:30, Lichthof

REMPI and UV-UV double resonance spectroscopy of tryptophan containing dipeptides — •Isabel H ünig, Kai Seefeld, and Karl Kleinermanns — Universit ät D üsseldorf, Institut f ür Physikalische Chemie 1, Universit ätstr. 1, 40225 D üsseldorf

Tryptophan ethylester (Trp-OEt) and the dipeptides glycine-tryptophan (Gly-Trp), tryptophan-serine (Trp-Ser) and proline-tryptophan (Pro-Trp) exhibit complex R2PI spectra in the region from 34550 to 35600 cm-1. The number of conformers observed for all four molecules in the investigated spectral range by UV-UV double resonance spectroscopy is surprisingly small. The spectrum of Trp-OEt consists of bands from three different conformers with redmost bands at 34811 cm-1, 34705 cm-1, and 34548 cm-1, respectively. The dipeptide spectra each consist of lines of two conformers in the investigated spectral range from 34550 to 35600 cm-1 for Gly-Trp, 34300 to 34960 cm-1 for Trp-Ser and 34650 to 35100 cm-1 for Pro-Trp. Our results on Gly-Trp are in agreement with previous observations by Levy and co-workers.